MSD has been working for more than a decade to reduce combined sewer overflows (CSOs) and eliminate sanitary sewer overflows (SSOs) into our local rivers and streams. To date, we have reduced CSOs by 7.8 billion gallons annually and made significant improvements in eliminating SSOs.


MSD completed the first phase (Phase 1) of its Wet Weather Program in 2021, is working to complete the second phase (Phase 2A) by the end of 2024, and will soon be negotiating with the U.S. EPA on the next set of wet weather projects (Phase 2B).




For detailed information on MSD's Wet Weather Program, including budget, schedule, performance metrics, potential project risks, etc., please view or download the reports below:



  • Consent Decree Quarterly Reports (select a report from the list below):
  • Consent Decree Annual Reports (select a report from the list below):


Graphic showing accomplishments during the first phase of MSD's wet weather program